Question

When the normal force is doubled, the coefficient of friction is.

• A. Doubled.
• B. Halved.
• C. Not changed.
• D. Tripled.

Answer 1

The correct option is C

Not changed.

1. Co-efficient of friction$\left(\mu \right)$ = $=\frac{frictionalforce\left(f\right)}{Normalforce\left(N\right)}$
2. Co-efficient of friction depends on the material properties of the two surfaces in contact and the roughness of the two surfaces in contact.
3. If the two surfaces in contact are rough, the coefficient of friction will be more and vice versa.
4. The normal force is basically a support force exerted on a body that is in contact with another stable body.
5. Co-efficient of friction is independent of the normal force.

Hence, if the normal force is doubled, the coefficient of friction remains unchanged and option (C) will be correct.